Sash-lock.



9W? L' e I H. BUTTRESS'.

l sAsH Loox. APPLICATION EILED FEB, 6,v 1908.

905 ,984. Patented Dec. 8; 1908.

UNITED STATESv PATENT OFFICE.

SASH-LOC'K.

Specification of Letters Patent.

Patented nec. s, 190s.

Application filed February 6, 1908. Serial No. 414,622.

`To all whom it may concern.'

Be it known that I, HOWARD BU'r'rnEss, e citizen ol the United States, residing at Los Angeles, in the county oi Los Angeles and State of California, have invented a new and useful SasheLock, of which the following a specification.

This invention relates to a sash lock which will normally permit the sash to be freely closed, but prevent its being o iened further than it is already opened, an an object ol the. invention is to provide convenient and easily o `erated means for releasing the lock torenab e the sash to be opened.

Another object `of the invention is to prov vde a sash look of this'character With means for locking the operating means in set position such that the sash can he freely moved in either direction.

Another object of the invention is to provide a sash lock of this character with means for locking the operating means in set position in which the sash can be freely closed and not opened, thereby safeguarding theA operating means against operation from ontsidev the window to release the sash.

In the accompanying draWingm-lfiglue 1 is an elevation of the lock, the sashes being removed. Fig. 2 is a vertical section through thc lock and adjacentpart ol the sash and casing. Fig. 3 is a horizontal section thercol. Fig. 4 is a perspective of the lock with the case removed. Fig. 5 is a perspcctive of the saine. The lock comprises a hase plate 1, bolts 2 ,slidably mounted therein, springs 3 for moving the bolts to locking position,Y a yoke lever 4 for moving thc bolts to unlocking position, a main levcr opcrn ting the yoke lever, and a knob Gdlfor operating the main lever.

y .A yoke 7 connecting the two bolts is preicrnhly arched, as shown, and thc yoke lever 4 is slotted as at 8 to cmlnace one ol the bolts 2 and cxtcnd under the arch of yoke 7. Seidv yoke lcvcr 4 is pivotcd on standards 9 cxtcndingl'roin baise plate l, and the main lever 5 is pivolcd on standards 1() also extending from said brise plate, .nid standards being preferably lormcd by slotting the base plate and bending up the inc-tal at the ends of the slots. A tubular guide 11 secured to base plate l, by its flange 12, receives the knob 6 which slides in said guide and projects at its inner end to engage the mein lever 5. The knob 6 is provided with a projection 'or pin 13, which, in the sliding movement of the The normal condition ol thc knob 6, works in longitudinal slot 14 in the tubular guide 11, said slot having notches or letersl extensions 15, 16 at the inner and onterfends thereof to receive the said pin or projection. A case 17, formed as a channel plate, extends over or hack of the above mentioned parts and is secured 'to hase plate l. as by means ot' lugs 1S on the lside llanges ol said case passing through slots 19 inv the bai-ic plate l and upset at their ends. Said case is provided with holes '.20 litting the bolt-s 2 to aid in guiding the same, the springs 3 for normally moving the bolts to locking position being arranged around the bolts and between the said case and the yoke-' connec fing the bolts. Said yoke 7 projects through slots in the bolts so as to i'orin an ellective abutment for the spring, and said yoke also serves as a stop lor limiting the outward movement of the bolts.

The hase 1 is formed with means for attachment to the Window casing 2] at the sides thereof in such ma nner that the bolts 2 will project into the ways in which the stiles of the sashcs run. The cnd portions of the base plate extend under the molding or stop22 at the inside of the window casing, the tubular guide l1 yextending through a hole in said stop so that the knob 6 projects from the said stop at the side of the window. Each Window sash 25 is provided with a series ol dctcnt incans comprising inclined tongues 23 in a longitudinal groove 24 in the edge of the sash stilc, these dctcnt means being inclined opposilcly on thc two sashcs, namely, upward and outward on thc lower sash and dmvnward and outward on thc upper sash. 'lhc sash lock is so placed the-t the bolts 2 cxtcnd into thc groovcs 24 in thc sashcs and cngagc thc dote-nt means 2-3 therein.

The operation ol the dcvicc is ss follows 1- dcvicc may he considered as that shown in Fig. I, the pin of knob G hcing dircctly at thc outcr cndoll slot 14. ln this position thc bolts arc hcl'd in locking position by their springs 2, and il either of thc sashcs be in closed position it can not bc. opened, as the dctcnt mcans 23 will engage with the corres ending bolt to prevent such movement. ll either of the sashes be partly opened it can not he further opened for the same reason, but it can be closed, the inclinedportions of the oetents 23 engaging the holt to press the same back and allow passage of the detente. The yoke lever 4, and inain lever 5 do not interfere j' with such motion, the bar 7 simply working back and forth without effecting yokclever 4.

in turn operates yoke lever 4 to press the yoke 7 back against the action of springs 3 and inove the bolts to unlocking position, so that either or both sashes can be freely opened as far as desired. knob 6, the springs 3 niove the bolts to locking position leaving the device 'in normal condition as before, so that the sash ,can not be further opened Without access to the operating means 6,. thus preventing opening of the sash from outside the Window. ','If it is desired .to fully release the sashes so that they can be freely moved up Vor down Without being unlocked each time, the knob 6 is pushed in and turned so as to cause the projection 13 thereon to enter the notch or slot extension 1 5 at the inner end of slot 14, thereby holding the bolts in'unlocking position.- If, on the other hand, it is desired to prevent operation of the operating knob 6, for example, by means of la person reaching under the opened window attempting to press in said knob, by use of a stick or other- Wise, the said knob is turned While in its outermost position so as to bring the projection 13 thereof into the notch or slot extension 16 at the outer end of slot 14. In this position the knob 6 can not be operated by simply pressing it in, but must first be turned back into line with the slot 14, an loperation which would be practically impossible for a erson outside of the Window, When the sash isy only slightly open, as foar ventilation.

What I claimfis: 1. A sash lock comprising tivo. bolts, a yoke connecting the bolts, springs pressing the bolts to .locking position, a yoke lever engaging said yoke to move the bolts to un-`v locking position, a main lever engaging the yoke lever, a slidably mounted knob engagknob in position to hold the bolts in unlockedposition, and means for locking said knob in position to allow the bolts to move to locking position.

2. A sash lock comprising a pair of locking bolts, springs for moving the bolts to locking On releasing the g ing said niain lever, means' for locking said' suesse position, a yoke connecting said bolts, a pivoted yoke lever engaging said yoke, a pivoted main lever for operating the yoke lever, and a slidable knob for operating the main lever. R

3. A sash loc-k comprising a pair of locking bolts, springs for moving the bolts to lookin position, a yoke connecting said bolts, a piv'- oted yoke lever engagingsaidl yoke, a 'pivoted main lever for operating the yoke lever, and a slidable knob for operating the 'main lever, said yoke lever being slotted and one said base plate, a yoke lever pivoted to said' standards and engaging said yoke, the other coil spring bearing against said case and said yoke lever, a pivoted main lever engaging the soA yoke lever, and 1a slidable knob for operating the main lever. l l 5. A sash lock comprising a pair of bolts, a yoke connecting said bolts, springs forLpressing said bolts to locking position, a pivoted"` yoke lever engaging said yoke, a pivoted main lever engaging the yoke lever, a tubular guide open at both ends, a knob slidably of the longitudinal slot, and a pin on said knob adapted to slide in said slots.

`and rotatably supported in said tubular guide, one end of said knob abutting against the main lever, said tubular guide having a longitudinal slot with offset slots at each end- 6. A sash lock comprising a pair of locking l bolts, an arched yoke With its ends extending through slots formed in said bolts, Spling means for normally holding said bolts in locking position, a curved pivoted yoke lever slotted to receive one of said bolts and adjacent portion of the yoke and engaging With the arched portion of the yoke, a pivoted main lever, a slidable knob for operating the main lever, and meansfor locking said knob When in depressed `or retracted position.

In testimony whereof, I' have hereunto set my hand at Los Angeles, California, this 30d" day of January 1908. l

' l HOWARD BUTTRESS. In presence of- GEORGE T. HACKLEY, FRANK L. A. GRAHAM. 

